Whatever occurred it certainly had nothing to do with industrial issues. Why the hell do people keep dragging industrial Us vs Them crap into safety threads anyway?
When you are tired, do you make more mistakes? When you have too much traffic in your sector because there is not enough staff, do you make more mistakes? When you have a manager beating you with a stick to work longer and harder, and never be sick, do you feel the pressure? When you have to work amongst the angst and hatred, do you distracted by the many conversions with your peers about you and your family's future?
It has EVERYTHING TO DO WITH INDUSTRIAL ISSUES.
I am not saying that in this particular case, it was totally because of industrial issues. But to come out and say it had nothing to do with industrial issues just shows your ignorance. We don't comment on safety related issues in your cockpit since we don't know enough about it, so you should think about this and consider not commenting on the relationship between industrial issues and atc safety since you have probably have no idea how things work in atc.